So you have acquired your AA powered flashlight and are scouting around for the best power option available. Undoubtedly the number pick for AA rechargeable battery power would have to be the eneloop pro from Panasonic. eneloop pro High Capacity Ni-MH [nickel-metal hydride] “Low Self Discharge” batteries makes use of Panasonic’s advanced rechargeable battery technology providing up to 2550mAh [milli-ampere hour] (AA batteries) of power and the ability to be recharged up to 500 times. Ni-MH rechargeable batteries have two electrodes inside the cell, Nickel Hydroxide and Hydrogen absorbing alloy. The battery chemistry of a Ni-MH rechargeable battery generates 1.2V. While alkaline batteries experience rapid drops in voltage Ni-MH rechargeable batteries maintain the same voltage throughout most of the entire charge. eneloop pro, high capacity Ni-MH rechargeable batteries feature added mAh power which should allow you to get the best results out of your flashlight.